Nemo’s patented bolt carrier and buffer system has never been offered in a builder’s kit until now. The same quality components high-end coatings and innovative recoil reduction technology that are used in NEMO’s OMEN and XO model lineup are now available in a kit for your large frame AR. Use this kit whether you are building a rifle from the ground up or looking to reduce recoil in your existing rig. The technology in the bolt carrier group reduces bolt speeds and felt recoil when the recoiling mass bottoms out in the buffer tube. Other products are designed to minutely dampen the force at the moment the recoiling mass bottoms out whereas NEMO’s design creates a dynamic solution at the beginning of recoil that creates a low “bottom-out” force. This is accomplished by forcing the buffer to bottom out and start its return before the BCG has finished its recoil cycle. The buffer and BCG momentum are opposite and the result is a noticeable low impact “bottom-out” force. - Kit includes: - NEMO’s complete Bolt Carrier Group stacked with premium features: - Recoil Reduction Carrier Plunger System High Pressure Bolt and Ti Firing Pin with return spring Tool Steel Ejector and Extractor with high strength springs One-Piece Gas Ring POF’s patented Roller Cam Pin Nickel Boron Diamond-Like Carbon and Chrome coatings Staked Carrier Key - NEMO’s proprietary Buffer with hardened Nickel Boron coated impact face - NEMO’s Buffer Tube with indexing tabs (MIL-SPEC Diameter) - NEMO’s Custom Buffer Retainer and spring - NEMO’s Custom tuned Buffer Spring - NOTE: Castle Nut & Receiver Plate NOT included.